.mainmenu-layout .top {
  height: 50px;
  background: #000;
  line-height: 50px;
  color: #fff;
}

.mainmenu-layout .core-layout {
  top: 50px;
  display: block;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
}

.mainmenu-layout .core-layout .menus {
  width: 200px;
  border-right: solid 2px #ccc;
}

.mainmenu-layout .core-layout .content {
  flex: 50%;
}
